功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2014年
12期
12108-12112
,共5页
谢君樑%陈希元%黄进%刘子睿%李宏
謝君樑%陳希元%黃進%劉子睿%李宏
사군량%진희원%황진%류자예%리굉
石墨烯%分散液%氧化还原法%胶体稳定性%DLVO理论
石墨烯%分散液%氧化還原法%膠體穩定性%DLVO理論
석묵희%분산액%양화환원법%효체은정성%DLVO이론
graphene%dispersion%redox method%colloidal stability%DLVO theory
通过氧化还原法合成石墨烯,结合1-萘甲酸的双极性作用防止石墨烯发生自团聚,得到稳定的胶体分散液。通过分析拉曼光谱的特征峰确定了氧化石墨烯的还原程度;利用 TEM观察到了单层、双层以及多层的石墨烯。通过测试分散液的 zeta 电位、粒径以及丁达尔效应,参照胶体的经典稳定理论-DLVO 理论,阐述了石墨烯分散液稳定存在的原因和机理,并进一步通过蒸发溶胶合成了自组装无基底的石墨烯薄膜。各项结果表明,利用该法合成的石墨烯分散液具有大量稳定存在的单层石墨烯,是当前石墨烯基微纳器件所需的优良前驱体。为液相化学法制备石墨烯提供了理论支撑,为石墨烯的后续应用开辟了新的途径。
通過氧化還原法閤成石墨烯,結閤1-萘甲痠的雙極性作用防止石墨烯髮生自糰聚,得到穩定的膠體分散液。通過分析拉曼光譜的特徵峰確定瞭氧化石墨烯的還原程度;利用 TEM觀察到瞭單層、雙層以及多層的石墨烯。通過測試分散液的 zeta 電位、粒徑以及丁達爾效應,參照膠體的經典穩定理論-DLVO 理論,闡述瞭石墨烯分散液穩定存在的原因和機理,併進一步通過蒸髮溶膠閤成瞭自組裝無基底的石墨烯薄膜。各項結果錶明,利用該法閤成的石墨烯分散液具有大量穩定存在的單層石墨烯,是噹前石墨烯基微納器件所需的優良前驅體。為液相化學法製備石墨烯提供瞭理論支撐,為石墨烯的後續應用開闢瞭新的途徑。
통과양화환원법합성석묵희,결합1-내갑산적쌍겁성작용방지석묵희발생자단취,득도은정적효체분산액。통과분석랍만광보적특정봉학정료양화석묵희적환원정도;이용 TEM관찰도료단층、쌍층이급다층적석묵희。통과측시분산액적 zeta 전위、립경이급정체이효응,삼조효체적경전은정이론-DLVO 이론,천술료석묵희분산액은정존재적원인화궤리,병진일보통과증발용효합성료자조장무기저적석묵희박막。각항결과표명,이용해법합성적석묵희분산액구유대량은정존재적단층석묵희,시당전석묵희기미납기건소수적우량전구체。위액상화학법제비석묵희제공료이론지탱,위석묵희적후속응용개벽료신적도경。
A stable graphene colloidal dispersion was synthesized through redox method.During the process,1-naphthoic acid,with its amphiphilic nature,was added for the prevention on graphene’s self-aggregation.Ra-man spectroscopy was used to confirm the reduction degree of graphene oxide by analyzing the characteristic peaks.Monolayer,bilayer and multilayer graphene sheets were observed under the transmission electron micro-scope (TEM).After the testing of zeta potential,average particle sizes and the Tyndall effect,according to the classical Derj aguin-Landau-Verwey-Overbeek theory,we elucidated the reason and mechanism why graphene colloidal dispersions existed stably and further produced the self-assembled free-standing graphene membrane by evaporating the hydrogel.All the results have demonstrated the as-prepared graphene dispersions have abun-dant stably-existed monolayer graphene,which played an important role as the excellent precursor of current graphene-based micro-nano devices.By pointing out this idea,we may provide theoretical support for the solu-tion-based method on graphene’s synthesis and find a new route for further application of graphene.